Multiple circuit bulb



Sept. 1*, 1936. SVSAMMUT 2,053,051

MULTIPLE CIRCUIT BULB Filed April lO, 1955 i I l Za l 624 lz 26 (d 24 .al

Patented Sept. 1, 1936 UNITED STATES MULTIPLE CIRCUIT BULB Saviour Sammut, Jersey City, N. J.

Application April 10,

3 Claims.

This invention relates to new and useful improvements in a multiple circuit bulb.

The'inventionhas for an object the construction of a Vmultiple circuit bulb which is characterized by an arrangement wherein a pair of laments are associated with the device in a manner so that one filament is continuously used When the .device is in a live socket, and the other auxiliary filament used as desired.

Still further the invention particularly proposes an arrangement whereby the auxiliary lament may be placed into and out of operation by the operation of a suitable switch.

Still further Vthe invention also proposes an arrangement wherein the multiple circuit bulb is provided with an insulation member having a shell contact and an end contact for engagement in a conventional lamp socket and wherein the end contact has an inward directed extension coactable with a movable contact to control the operation of the auxiliary filament.

Still further the invention proposes an arrangement whereby the movable contact is guided to move from a position in contact with said eXtension to a position out of contact for controlling the auxiliary filament.

Still further the invention also proposes an arrangement whereby the movable contact is snapped in either position as it is moved from one to the other position so as to maintain its condition of contact or its condition in which the contact is not made.

Still further the invention also proposes an arrangement whereby the movable contact may be latched in operative position so that both laments operate in unison.

Still further the invention proposes the construction of a device as mentioned which is simple and durable and which may be manufactured and sold at a reasonable cost.

For further comprehension of the invention, and of the subjects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the `various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:

Fig.,1 is a vertical sectional view of a multiple circuit bulb constructed according to this invention.

Fig. 2 is a fragmentary enlarged detailed view of a portion of Fig. 1 showing in particular the upper end.

Fig'. 3 is a fragmentary sectional view taken on the line 3 3 of Fig. 1.

Fig. 4 is a horizontal sectional view taken on the line 4--4 of Fig. V1.

Fig. 5 is a fragmentary horizontal section view taken on the line 5-5 of Fig. 1.

1935, Serial No. 15,523

Fig. 6 is a view similar to a portion of Fig. 2 but illustrating a modified arrangement.

Fig. '7 is a horizontal sectional view taken on the line 'i-- of Fig. 1.

The multiple circuit bulb according to this invention comprises a transparent vacuum casing I5 having an interior depending stem II. This vacuum casing and stem preferably should be constructed of glass or similar non-iniiammable material. An insulation member consisting of an upper section I2 and a lower section I3 is attached upon the top of the casing IIl and is formed with an interior hollow region I4. 'I'his hollow region is arranged between the sections I2 and I3 so that when the sections are separated the hollow is exposed. In the normal operation of the bulb the sections I2 and I3 are permanently secured together such as with suitable cement or other arrangement.

A shell contact I 5 is mounted upon the insulation member and is adapted to engage in a conventional lamp socket. An end contact I6 is mounted upon the end of the insulation member for engaging the end contact in a conventional lamp socket. This end contact comprises aring shaped member supporting an extension I6- extending into the hollow I4. A filament I1 is supported upon the lower end of the stem I I on a plurality of supporting fingers I8 projecting from the stem. An upper auxiliary filament I9 is supported upon a plurality of members supported upon the stem II at a higher point to the members I 8.

The device is provided with a circuit by which the filament I1 is lighted when the bulb is engaged in a live lamp socket. This circuit extends from the end contact I6 to a lead 2I passing through the insulation member and through the depending stem II and directly attached upon one end of the iilament Il. The otherlend of the filament I'I connects with a lead 22 which also extends through the stem I I and at the point 23 electrically connects with the shell contact I5.

A Contact 24 is movably arranged in the hollow I4 and is adapted to engage with the extension I6' in one position and is also capable of assuming another position out of contact with the extension. More particularly the movable contact 24 slides upon a support bracket 25 which is attached to the under side of the insulation member I2. This bracket is formed at the free end with a head 26 limiting motion of the movable Contact 24 to a position in which it engages with the extension I6. 'Ihe movable contact 24 is capable of moving along the bracket to a position out of contact with the extension.

A construction is arranged within the hollow I4 and is adapted to urge the movable contact into one or the other position. More particularly this construction comprises a pair of rods 21 piv- .,contact. trated in Fig. l ofthe drawing the auxiliary fila- The openings in the top of the casing 28 through which the rods 2'! extend are arranged upon the dead center between the two extreme positions `of the movable member. The arrangement is such that the springs 29 serve to holdthe movable member in either position merely depending upon which position the movable member is in.

An arrangement is provided for manually mov- Y ing the movable member from one to its other position. This Ymeans comprises cords 3Q attached at oneof theirends upon opposite ends oi' the movable member 24 and engaging through .supports 3| upon the sides of the hollow I4 and extending through passages 32 downwards to the extreme bottom end of the insulation member and to the exterior. Tags 33 and 34 are respectively attached upon they ends of the cords 35. Thek tag'33 is provided with the word on designating that when this cord is pulled the movable contact 24 will be engaged with the extension I6'. Thertag -34 is provided With the word 01T to indicate that 'this cord may be pulled to break the connection. Y

A circuit is arrangedin parallel with the previously mentioned circuit and is for the purpose of controlling the operation of the filament I 9. This circuit extends from the shell contact I along the lead 22 -to one end of the filament I 9 through the iilament I9 toa lead 35 which extends throughv Yofthe movable contact without disconnection of the lead 35 withthe movable contact.

In Fig. 6 a modied form ofV the invention has .been disclosed whereinfthe movable contact 24 is supportedY by a bracket 25' attached at its ends arranged upon the under side of the insulation membersection I2. The movable contact 24 is slidable intermediate the ends of the bracket 25. A set screw 36 threadedly engages through the extension IIirom the exterior andis adapted to engage in an opening 24 in the movable member 24 for the purpose of holding the movable member in itsoperative condition. `With vthis arrangement it is possible to lock thel movable member in the operative condition so that the auxiliary filament will light simultaneously with the filament I 'I. v

The operation ofthe device is as follows: rlihe lampsinay be engaged in a ,live lamp socket to light the lament I1. ,A circuit exists from the end contact through the lament II to the `shell In the condition of the device illusment I 9 will alsol light in that la circuit :exists `from the end contact I5, the extensionv I6', the `movable contact 213, the lead 35, the -iilament I9, lthe lead 22 and the shell contact I5. If itis `desired to operatev the lamp without the auxiliary filament I9 being lit, then the off cord 30 should lbe pulled solas vto break the circuit of the auxiliary filament between the contacts I6y and Z4. A feature of the construction isfthat the lamp may be operated normally with one lamerit, may

be operated bright with both filaments, and may be operated with the auxiliary filament alone in the event that the normal filament burns out.

While I have shown and described the preferred embodiment of my inventi0nit `is to be understood that I do not limit myself to the precise construction herein disclosed and the right is,.reserved to all changes and modifications com- 'ing within the scope of the invention as deiined jin 'the appended claims.

Having thus described my invention, what I Y claim asnew, and desire to secure by United StatesLettersPatent is:-

1. A multiple circuit bulb, comprising a transparent vacuum casing with a depending interior stem, an insulation member attached on top of said casing ,and having a hollow region, a shellV and engageable with said extension and movable necting in series said Yshell contact,rthe other filament, thevmovable contact and the endv contact,and means for locking the movable contact inengagement with said extension.

2. A multiple circuit bulb, comprising a transparent vacuum casing with a depending interior stem, an insulation member attached on top of said-,casing and having a hollow region, a shell contact on said insulation member, an end contact on said insulation member and having an extension into said hollow, a pair of laments on said stemfand within said casing, acircuit con.- necting in series the end contact, and one of said filaments, a contact slidable in said hollow region and engageable with said extension and movable to a positionout of engagement Vwith the extension, means for manually moving said Contact Y Yfromone to the other position, a circuit connect- Y ing in series. said shell contact, the other iilacontact. Y K

- v3...Amultiple circuit bulb, comprising a transparentvacuumcasing with a depending interior stem, an insulation member attachedon top of ,50 the exterior and engageable with said movable said casing and having a hollow region, ashell .contact on said insulation member', an end con- :tact on saidinsulationmember'and having an extension into said hollow, ra pair'offilaments o n said stern and within said. casing, a circuit connecting` in series the end contact,and one of said iilaments, a Ycontact slidable insaid `hollow region and engageable with said extensionfand .movable to a position out of engagement with the extension, means for manually moving said contact from one to the other position, and a circuit connecting iii-series said shell contact, the other lament, the movable contact and the end contact, comprising a screw threadedly. engaged 'through said extension from the exterior and engageable with said movable contact, and engaging into an opening in the movable contact.

sAvIoUR sAMMUT. 

